To do this you must join the Ouka Bandits.

The easiest way is to go to the road and do the inkling with the bandits. Choose "stealing is bad you know" after talking to Yuma, say "I have a grudge..."

Then go the Castle, Minoro talk to the gaurd leader and select "I was approached by...".

After the cutscene with Genjuro, wait for Yuma and Ituse to leave the room, then Kill Genjuro.

Then after the auto cutscene where all the bandits bow down to you, go to Jiri the Bandit job leader, he'll say a couple of things - just respond and move on.

When you get the menu with three options, choose the one that asks for money.

Go down the list to I demand 1,000 and select it.

He'll then talk, then select just dish it out. Go to Takatane village and sleep.

You can go to Jiri once every day and demand 1,000 and he'll just keep dishing it out.